There has been much speculation in the blogging world that they pushed their luck and this is a "sign from G-d to stop." Since there have been no quotes in the media from Michelle's doctors about her health regarding any chance of future pregnancies, we don't know what her future holds.
What we DO know is that their faith in G-d hasn't changed and that they still believe it's up the G-d to decide what will happen. Do you think they will take this as a sign and take a break? Do you think it's possible she's had so much damage that she's probably incapable of more pregnancies? Do you think they are even focused on that right now?